US Ambassador to the United Nations Nikki Haley announced Monday that the United States and almost 40 other nations would not participate in the first-ever talks on an international treaty to ban nuclear weapons.

President Barack Obama's administration also opposed the talks, which the General Assembly voted to approve in December, and nuclear powers Russia and China also are not taking part. United Kingdom Ambassador Matthew Rycroft said his country also would not attend the talks because "we do not believe that those negotiations will lead to effective progress on global nuclear disarmament.

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